Multilevel inverters have been an attractive topology for academia as well as industry in the recent decade for high power and medium voltage energy control. An asymmetric multilevel inverter, a new topology increases the level of output with reduced lower order harmonics and total harmonic distortion. In this topology, the output voltage and power increases with the number of level and increasing output voltage does not require an increase in voltage rating of individual commutated devices. In this paper, a fifteen-level asymmetric MLI with three DC sources and seven switches have been proposed which will be suited for fuel cell applications. For the proposed MLI, a new hybrid modulation technique combining the PWM and fundamental frequency switching technique is developed. The inverter structure is studied and simulated in MATLAB/SIMULINK for investigating the spectral quality of the output. Total Harmonic Distortion (THD) is analyzed for the various PWM techniques and the results are verified through simulation results.
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Author Name: S.Dharani and Dr.R. Seyezhai
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Keywords: Asymmetric Multilevel inverter, Total Harmonic Distortion, Sinusoidal Pulse Width Modulation, Fundamental frequency Pulse Width Modulation.